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Porous Pavement for Cold Climate Storm Water Management

October 27, 2010 By: Anna14 Comments

Porous Pavement in Ann Arbor, Michigan

Porous Pavement in Ann Arbor, Michigan

While visiting Ann Arbor, Michigan this summer, I got an upclose and personal view of  pervious (porous) pavement. I have always been a fan of this type of pavement to counteract our “paving paradise to put a parking lot” philosophy and reduce our storm water run-off problem.  You know.  All the flooding associated with more pavement than grass?

So, What’s the Problem with Parking lots?

Parking lots and other impervious sites, such as driveways, sidewalks, and buildings, contribute to an increase of pollutants into our waterbodies.  According to the EPA, stormwater runoff picks up the following:

“Sediment can cloud the water and make it difficult or impossible for aquatic plants to grown. Sediment also can destroy aquatic habitats.

Excess nutrients can cause algae blooms. When algae die, they sink to the bottom and decompose in a process that removes oxygen from the water. Fish and other aquatic organisms can’t exist in water with low dissolved oxygen levels.

Bacteria and other pathogens can wash into swimming areas and create health hazards, often making beach closures necessary.

Debris- plastic bags, six-pack rings, bottles, and cigarette butts – washed into waterbodies can choke, suffocate, or disable aquatic life like ducks, fish, turtles, and birds.

Household hazardous wastes like insecticides, pesticides, paint, solvents, used motor oil, and other auto fluids can poison aquatic life. Land animals and people can become sick from eating diseased fish and shellfish or ingesting polluted water.“

So how Does Pervious Pavement Help?

 asphalt porous pavement

Up close view of asphalt porous pavement

First, let’s clarify what is pervious or porous pavement.  According to the Stormwater Manager’s Resource Center,

“Porous pavement is a permeable pavement surface with an underlying stone reservoir that temporarily stores surface runoff before infiltrating into the subsoil. This porous surface replaces traditional pavement, allowing parking lot runoff to infiltrate directly into the soil and receive water quality treatment. There are several pavement options, including porous asphalt, pervious concrete, and grass pavers. Porous asphalt and pervious concrete appear the same as traditional pavement from the surface, but are manufactured without “fine” materials, and incorporate void spaces to allow infiltration.” [Source.]

For years, I have known about porous pavement and was leery of the freeze and thaw issues that I thought could impact asphalt or concrete pervious pavements effectiveness. More northern climates are using this method to comply with city requirement of reducing storm water drainage as evidenced by my recent close encounter of the pervious pavement kind.

It is not too often you see cold climate pervious pavement installations. At least I haven’t seen them.  However, in 2007, the University of New Hampshire installed a pervious pavement parking lot.  UNH’s installation was one of the first major pervious pavement projects in New England. [Source.]  Talk about testing it in a really cold environment.

Since 2004, UNH’s Storm Water Management Center was formed with a mission “dedicated to the protection of water resources through effective stormwater management.”  Testing cold climate pervious pavement was just a natural progress in their stormwater management efforts.

Interested in installing cold climate pervious payment?  See the Center’s 2009 guidelines for the installation of porous pavement.

But does it work?

Make-up of Porous Pavement

Make-up of Porous Pavement

Several winters later, UNH can dispel the myth that pervious pavement won’t work in cold climates.  A 2008 article entitled “Pervious Pavement” stated

“However, according to Dr. Robert Roseen, director of the University of New Hampshire Stormwater Center (UNHSC), stormwater management systems using infiltration and filtration mechanisms, if properly designed, can work well in cold-weather environments. He has been leading a four-year research effort focused on monitoring the year-round performance of a porous asphalt placement that was installed on the UNH campus. In addition, the UNHSC is hoping to shed light on the functionality of pervious concrete by testing a large placement that was also installed on the university campus in August 2007—the first major pervious concrete parking facility in New England. The purpose and function of the UNHSC is to evaluate the range of stormwater treatments systems available to designers, including proprietary and nonproprietary systems.”

However, according to Stormwater PA,

“Pervious pavement is not recommended for high traffic areas because of the potential for clogging, nor is it a good idea for stormwater “hotspots” which generate highly contaminated runoff with a higher than usual concentration of pollutants. Areas of low soil permeability, seasonal high groundwater tables, and areas close to drinking water supply wells should also be avoided.”

Want to see pervious pavement in action?  See the below video the demonstration of pouring 1500 gallons of water in five minutes on the pavement with very little runoff.

Cost and Maintenance

This system does not come without cost.  Dr. Roseen, UNH Stormwater Center Director, stated that normal parking lots have a 12 to 15 year life in northern climates due to freeze/thaw.  On the other hand, previous pavement can last over 30 years.  The reconstruction of the UNH parking lot was much more costly than repaving; however, according to Roseen, the University will see a payback on its investment. [Source.]

“For new development, Roseen says that although material costs are approximately 20 to 25% more than those for traditional pavement, the total project cost for these systems with reduced stormwater infrastructure is comparable to standard pavement applications with which stormwater infrastructure is required.”

As for maintenance,  see here for the Center’s winter and maintenance guidelines.  What struck me in the maintenance guidelines was the reduction in deicing materials.  The guidelines state,

“Up to ~75% salt reduction for porous asphalt can be achieved. Salt reduction amounts are site specific and are affected by degree of shading.
USE SALT REDUCTION NUMBERS WITH CAUTION!!!”

In addition, black ice, which is melted water that forms back into ice as the temperatures fall, is reduced with this type of application.  The melted water drains through the pavement which alleviates black ice.

The Stormwater PA noted that cold climates pose challenges for this type of pavement and requires planning with regards to plowing, use of road salt and other maintenance. The agency further noted that failures of porous pavement usually arise during construction, so care must be taken in the installation of a pervious pavement project.

Concrete vs Asphalt

For more information about using concrete versus asphalt pervious pavement, see the article, “Pervious Pavement,” and USGBC’s article, “Improvement of Porous Pavement System for on‐site Storm Water Management.”

Questions

Does your town have a pervious pavement parking lot or road?  If so, how has it fared?

Do you have a pervious pavement driveway?  If so, how has it fared?

Thoughts about the cold climate pervious pavement?

Thoughts about concrete versus asphalt pervious pavement?

Does anyone have grass pavers?  If so, thoughts?

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About Anna

Anna Hackman is the editor of Green Talk, and owner of The Naked Botanical and a avid (okay obsessed) gardener. She also loves video and podcasting and hosts Green Talk TV and Green Talk Radio. Her most important role is being a mother of four boys.

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Comments

  1. 4

    Sediment Control says

    November 8, 2010 at 7:12 pm

    As long as it makes sense as along-term strategy and is useful in keeping our drinking water fresh, then I say there ought to be more projects like this.
    -Jack

    Reply
  2. 5

    hho says

    November 23, 2010 at 5:06 pm

    I think this is a very good strategy for getting the water out of the driveways. Anyway, when it’s raining a lot the water will run on the surface rather to infiltrate into the pavement.

    Reply
  3. 6

    salt lake city asphalt contractor says

    June 14, 2011 at 6:17 am

    This is a good strategy to implement in which it can prevent floods and any dangerous phenomena that can occur. its very amazing to see the water just run in the surface in short amount of time. Though costly, but it really can help the city’s improvement.

    Reply
  4. 7

    Vince Caruso says

    September 5, 2011 at 10:58 am

    Porous pavement is not just for parking lots anymore. Bangor ME is now paving it’s downtown streets in porous, a place that gets very cold. Chicago is doing 2,000 miles of of back alley service streets in porous cement, Philly is planning to do all new and repaired streets in porous, and Ann Arbor has done and plan more streets in porous.

    Reduce flooding, 70% less noise, no heat island, no water pollution runoff and it cost less than conventional roads now.

    Reply
    • 8

      Anna@Green Talk says

      September 5, 2011 at 11:43 pm

      Vince, this is great. When you say it is less expensive than conventional paving, how has this changed? Anna

      Reply
      • 9

        Vince Caruso says

        September 19, 2011 at 6:40 pm

        The Chicago manager said it is ‘great value’; Georgia DOT and consultants now state it is less expensive, ‘if your paying more your paying to much!’. A developer out west did a 170 home development in porous roads, sidewalks and driveways and saved $250K over conventional! And when many of his neighboring communities had major flooding of homes and streets in a large rain event, two years later, they had no standing water or runoff!

        US EPA now recommends it for roadways, calls it ‘Cool Pavement’

        Philly is now planning on using it to ‘save money’ after an EPA ruling that has them forced to cleanup the runoff into the rivers that supply drinking water to tens of millions down stream.

        Up to 70% less noise(!), no pollution(!), no flooding(!), handle up to 200″ an hour, same or less cost, no heat island, no hydroplaning, no slip and fall, up to 70% less salt, less plowing, no black ice, no heat shock to streams, recharge groundwater, great for street trees, works in the north, long lasting, better traction (no need to grove), no road spray, vacuum twice a year (like your sons room), … what’s not to like.

        Reply
  5. 10

    Violet Sullivan says

    January 19, 2016 at 3:33 pm

    That would be really nice to be able to use this type of pavement for my driveway. There is often a large puddle of water at the bottom. If my budget allows it, I’ll definitely have to see if there are any paving companies in my area that offer this type of material.

    Reply
  6. 11

    InterloCKING vAUGHAN says

    November 15, 2016 at 6:32 am

    This is an awesome post with lots of information. Great way to get water out of driveway. Thanks for Sharing

    Reply

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  6. Green Building at its Finest at the Ford Rouge Factory | Green Talk® says:
    January 22, 2013 at 6:05 pm

    […] The Rouge offers a complex natural storm water management system.  Most of the rainwater that falls on the roof is absorbed by the green roof.  The balance is drained off into stone storage basins located under the porous pavement parking lot nearby. (For those wishing to read more about porous pavement and its benefits, read here.) […]

    Reply

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